He took it all in while maintaining his cool demeanour, wondering at how this turn of events had unfolded. Must brush up on my Legilimency, he thought to himself, rather aghast that it hadn't worked out quite as planned. Sure, she had finally openly admitted her feelings regarding him, but to see this turn in demeanour was not acceptable for his future plans. He would have to make sure to change things accordingly if he wished to succeed.
On that note, he turned to watch her as she'd passed by him, shooting out a hand to hold onto her arm for a minute, wanting to make himself very clear. "Narcissa, you have to understand me. Now is not the best time to be pursuing one's inclinations, no matter the clarity of one's emotions and desires. Someday soon, you will have to realise that." The cryptic words left his lips in a hushed tone, all seriousness laced in between each word. Lucius meant to make a point, but he thought it may not be understood as he intended. As he considered it further, he released her arm to brush past her as she'd done to him, making certain to graze her shoulder as he went
With a quick turn of the head, he added a parting thought: "If it makes you feel like less of a fool, I nearly confessed something which you may have longed to hear." At that, he swiftly left the Potions classroom, buttoning up his dress shirt and narrowing his gaze. Upon spotting a stray young Slytherin trying to sneak back toward the common room, he snarled a warning and pushed past, heading toward the decanter of brandy that he'd kept for such occasions.